The new Prototype class for the TUDOR United SportsCar Championship has taken a blow this weekend, as Team Sahlen has announced that it will not be running its two-car Daytona Prototype program in the TUSC’s inaugural season.

Last month, the team had said it would field the same No. 42 (pictured) and No. 43 BMW/Riley Daytona Prototypes in 2014 that they fielded in the GRAND-AM Rolex Series this past year. Wayne Nonnamaker and Dane Cameron were slated to drive the No. 42, while Joe and Will Nonnamaker were to drive the No. 43.

This past year, Wayne and Cameron logged two Top-5 finishes en route to 10th in the Rolex Series DP championship, with Cameron almost securing a win for the No. 42 at Road America before a gearbox failure knocked him out late. Joe and Will finished 16th in the standings.

“We’re still going to be racing somewhere within the IMSA family, and believe very heavily in the direction the Frances have taken the series,” Will Nonnamaker told RACER Magazine’s Marshall Pruett. “We will be back next year, and will announce those plans in the next few weeks.”

As for where the Sahlen camp will end up in 2014, that remains to be determined.

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Cooper MacNeil, who enters the TUSC after winning back-to-back driving titles in the American Le Mans Series’ GTC category, will once again be behind the wheel of the No. 22 Alex Job Racing Porsche next year. But he’ll have a new partner.

Leh Keen, the 2009 GRAND-AM Rolex Series GT champion, is now on board at AJR, replacing Jeroen Bleekemolen as MacNeil’s teammate. Keen and MacNeil worked together during the latter’s 2012 GTC title run, and together, they won three races that season (Lime Rock, Road America, Virginia).

Now, they’ll focus on becoming the first champions from the TUSC’s GT Daytona (GTD) class.

“We get along really well and he’s a damn good driver,” MacNeil said of Keen in a statement. “He helped me win my first championship in 2012 and we will try our best to do the same in 2014.

“At the same time, I’m upset to see Jeroen become my competition, because I really liked him driving with me, not against me. But I wish him the best with Viper.”

As for Keen, he’s happy to be able to continue his history with the AJR camp.

“I really have to thank [sponsor] WeatherTech and Alex for bringing me on board for the full season,” he said. “My history with Alex shows how strong our relationship is and he runs the best program out there.

“Next year will be extremely competitive, but with a car like the new 991, a team like Alex Job Racing, and with Cooper as my co-driver – we have won championships in the past and will be going for the first GTD championship ever.”